Assjgnob to general electbic



J. J. FRANK.

ELECTRICAL APPARATUS.

APPLICATION mzo JUNE 21. 1921.

/a1annnnrflaffafffrflffnrrllfrfrlll Patented; NOV. 28, 1922.

r v 'Invehtori John JfFrank,

His Attrney Patented Nov. 28, 1922.

RItWrsEIELi),` MAssAcHusE'rTs, iissiGNoR y To GENERAL ELECTRIC 'y coiviriiivY, A CORPORATION 0E NEW YORK. i

. JioHN J. FRANK, E

` ELECTRICAL` ARRARAtrus;4

Application IedJune 21,

an improved construction'and .arrangement of parts which is economical and readily manufactured. i f

In oil submerged electrical apparatus, such as transformers, some reactors,`oil switches and the like', it has been, found that the air space abovethe oil in the casing which houses the' apparatus has many disadvan- 'tages in addition to making theapparatus fbulky and'therefore needlessly expensive.` It accordingly has beenproposed to eliminate'the air space and fill the casing'entiie `ly with Ioil and lto take care of the cir- `pansion and contraction of the oil content 'thereof by the AprovisionV of an auxiliary `tank Ior casing, generally styleday i"conser vater,` which Yis arranged to communicate vwith the main casing.,`

Such'fconservators, according. tovv the best practice','are"made` not onlyto keep theair away from the hotV oil `and thereby prevent sludging or'rapid oxidization ofthe oil,`but` to collect and" trap' moisture; a VVVspecial 35,'sump ,being generally garovided to this end 'as taught in theU. LKulka No. 1,002,527.'` 1

`In the practice of my y y arel provided inthe constructionv of the main casing for accomplishing thecollectf" 'ing and trapping ofthe moisture without lthe4 provision of a special sump on lor con-` nected with the auxiliary casing; This construction of `the -mainca'sing resultsin` a Very ruggediand very simple andadvan tageousltypeof tank construction'.

For 4a morefcomplete understanding,ofV the naturel and objects of my invention,` reference should behad to the following de-' tailed description when taken in connection with the accompanying drawing in which:

Fig. 1 shows, partly in section and partly f in side elevation, a main casing housing a transformer and provided with a conserva- "ing omittedin thelinteresto'fclearness;v

'p12 into thetop of themain cas'ii'ig 10\;Vsuch Letters' Patent to l' invention, y means f 1921. SeriaiNLUsaAo'i; 1

tor in accordance withy myfini'fention.` Figs. i, l

2, 3 and 4 similarly show modifications. n

Referring now-.tothe drawing, `-10 `denotes a main.- casing Whichfhouses vla transformer 11, thecasingha'vingan auiilliary casing j 12 communicating therewith` and provided withabreather 13. An insulatingfbushing for alead tothe transformer n winding is shown. at 14, other 'bushings loey Communication 4between the `auxiliary casing 12 and themain casing-10 is showin as a restricted' passage at `1,5" leading ldirectlyfrom the bottom-'ofA theauxiliary casing passage being restrictedin order 'tofpre if' vent or reduce the occurrence -of convection currents Vwhich would otherwise V'cause the hot oil in the `mai-n casing to rise quickly into the auxiliary casing1j In i thismanner` the oil inthe auxiliary casingf'12is-main-f' tained relatively cool therebywreducingf-the tendency toV ysludgingi by reason-of"hot oil therein being "exposedy to tlieaiin*"A `In order to preventmoisturejand the likewhich may have collected inthe bottoinf of'f' lthe auxiliary casing 12 ifrom' passing oli-'- rectly into the mainfcasing -10'and onto the electrical,A apparatus "I 'i employ a" collecting means shown @at 16 which is's'e'cured interorlyto the :cover 'whichgmeans' comprises af" receptacle 17 having adrain l18 running ytov i some convenient `point exterior to the `main casing and 4 controlled by the tap or cock 19. *i At intervals, determinedflo'y' :the 'judg- 'inefntof `the operator in` attendance uponl the apparatus, the receptacle '17'y is drained byfopening Vthe cock `19`suficientlyto draw i off all `vmoisture and the "like `which has collectedv there. 1 4 95 In Fig. 2-I have shown a modified 'type` of collecting means vdisposed under the cover ofthe apparatus* The means'here shown comprisesthe"chamber"26' formedby thewall 42'? which'is cast integrally-on'lloo the cover ofthe maincasing. Thisfchainber l hasan opening 28 well'above its bottom which communicates with they main f, casing,4 aportion of the chamberf extending overto theedge of the cover where a tap or cock k 29 is provided to drain off the .moisture` which may have collected inthe bottom ofl l the chamber. tending operator to judge when'to drain off the collecting means, I provide the gauge i cal In order 4to assist thev at rectly from its top to the auxiliary chambery 12. In practice, whenever the water is visible in the bottom of the gauge glass, it

should be drawn oil.

. vIn Fig. 3 I have shown stillv another modilication of ra collecting means which may be formed in the cover of the main casing. In this form an'inte'g'ralledge 36 with an upf turned edge 37 is shown about the inner periphery` of the cover. c rIhe auxiliary casing .12- eommunicates with'the main casing at a pointv directly-above this ledge so that its edge 37 serves as a dike to retain any water or moisture that may pass out from the auxiliary casing 12. A tap or cock 39 is provided to drain oli the moisture which maybe collected in this means.

p In Fig. 4 I have a still Jfurther modifica-y tion, similar to Fig. 3, in that a ledge 46 is employed to trap the moisture, but arranged so that the auxiliaryrcasing i2 need not be connected to-the main casing dir ctly over the ledge 46. `This arrangement involves the use of a deflector 4S secured in the cover of the main casing but spaced therefrom, the edges of which project over the upturned edge 47v of the ledge. Any moisture which passes from the auxiliary casing 12 to the main casing is deflected by the detlector 48 onto the ledge 46 where it is caught by the edge 47 and retained, but from which it may be drained'bytheY cock: or tap 49.

Having now .described several embodiments oi' my invention which are at present the best means known t0 metor carrying the v same into eiect, I would have it understood i that these are' merely illustrative, and that I do notmean to be limited-thereby to the precise details shown nor restricted in the choice of recognized equivalents except as defined in. my claims hereunto annexed.

What I claim as new .and desire to secure by Letters Patent of the United States7 is :H 1. A main casing for electrical apparatus adapted to be iilled completely with a fluid insulating medium, an auxiliary. casing adapted to serve as an expansion chamber for said insulating medium7 and a collecting means secured interiorly of the main casing .and arranged to trap moisture passing from said auxiliary casing to the main casing.

2. A main casing for electrical apparatus adapted to be lilled completely with a fluid insulating medium, an auxiliary casing adapted to serve as an expansion chamber for said insulating medium, and a collecting means secured interiorly of the main casing v and arranged to catch moisture from the auxiliary casing, said collecting means being provided with a drain.

3. A main casing lfor electrical apparatus adapted to be iilled completely with a luid insulating medium, an auxiliary casing conimunicating'with the main casing to serve as an expansion chamber for said insulating medium, and a moisture collecting means secured interiorly of the main casing and disposed below the communication-between the auxiliary casing and the main casing.

4. A main casing for electrical apparatus adapted to be iilled completelywith a lluid insulating medium, an auxiliary casingcommunicating with the main casing to serve as an expansion chamber for said insulating medium, and a moisture collecting receptacle secured in the cover of the main casing below the communication betweeny the auxiliary casing and the inain casing, said re ceptacle being provided above its bottom with a communication leading to the main casing.

5. A main casing for electrical apparatus adapted to be iilled completely witha fluid insulating medium, an auxiliary casing vcommunicating with the main casing to serve as an expansion chamber for said insulating medium, and amoisture collecting receptacle secured in the cover of the main casing below the communication between they auxiliary casing andthemain casing, said receptacle being providedfabove v'its bottom with a communication into the main casing and with a drain leading 'directly from its bottom.

6.,A main casing `for electrical apparatus adapted to be filled completely with a fluid insulating medium, an auxiliary casing coinf municating with the main casingto serve as an expansion chamber for said insulating medium, a moisture collecting receptacle secured in the cover ofthe main casing below the communication between the auxiliary casing and the main casing, said receptacle being provided above its bottom with an opening leading into the main casing and with a drain leading directly Jfrom its bottomand an external tap controlling said drain. l

In witness whereof, I have hereunto set my hand this 18 day of June, 1921.

' JOHN J. FRANK. 

